Philips LPC2129 - Acceptance Filter Registers; Table 145: Acceptance Filter Modes Register (AFMR - 0 Xe003 C000); Table 146: Standard Frame Start Address Register (Sff_Sa - 0 Xe003 C004); Table 147: Standard Frame Group Start Address Reg (Sff_Grp_Sa - 0 Xe003 C008)

CAN Controllers and Acceptance Filter 207 May 03, 2004
Philips Semiconductors Preliminary User Manual
LPC2119/2129/2292/2294ARM-based Microcontroller
ACCEPTANCE FILTER REGISTERS
Acceptance Filter Mode Register (AFMR - 0xE003 C000)
Standard Frame Individual Start Address Register (SFF_sa - 0xE003 C004)
Standard Frame Group Start Address Register (SFF_GRP_sa - 0xE003 C008)
Table 146: Acceptance Filter Modes Register (AFMR - 0xE003 C000)
AFMR Name Function Reset Value
0AccOff
1: if AccBP is 0, the Acceptance Filter is not operational. All Rx messages on all CAN buses are
ignored.
1
1AccBP
1: all Rx messages are accepted on enabled CAN controllers. Software must set this bit before
modifying the contents of any of the registers described below, and before modifying the
contents of Lookup Table RAM in any way other than setting or clearing Disable bits in Standard
Identifier entries. When both this bit and AccOff are 0, the Acceptance filter operates to screen
received CAN Identifiers.
0
2eFCAN
1: the Acceptance Filter itself will take care of receiving and storing messages for selected
Standard ID values on selected CAN buses. See “FullCAN Mode“ on page 210.
0: software must read all messages for all enabled IDs on all enabled CAN buses, from the
receiving CAN controllers.
0
Table 147: Standard Frame Start Address Register (SFF_sa - 0xE003 C004)
SFF_sa Name Function Reset Value
10:2
The start address of the table of individual Standard Identifiers in AF Lookup RAM. If the table
is empty, write the same value in this register and the SFF_GRP_sa register described below.
For compatibility with possible future devices, please write zeroes in bits 31:11 and 1:0 of this
register. If the eFCAN bit in the AFMR is 1, this value also indicates the size of the table of
Standard IDs which the Acceptance Filter will search and (if found) automatically store received
messages in Acceptance Filter RAM.
0
Table 148: Standard Frame Group Start Address Reg (SFF_GRP_sa - 0xE003 C008)
SFF_GRP_sa
Name Function Reset Value
11:2
The start address of the table of grouped Standard Identifiers in AF Lookup RAM. If the table
is empty, write the same value in this register and the EFF_sa register described below. The
largest value that should be written to this register is 0x800, when only the Standard
Individual table is used, and the last word (address 0x7FC) in AF Lookup Table RAM is used.
For compatibility with possible future devices, please write zeroes in bits 31:12 and 1:0 of
this register.
0